MUG is also used in the context of "mugging for the camera"..... that's all the people who make faces and/or make sure they are noticed when the camera points thier direction. laugh Such as crowds at a sports event, or people in the background of filming. It is derived from the face definition of mug, I'm sure.

S (who just couldn't resist confusing the definitions more wink )

"Well, let's see, so far I've been given a glimpse of ritual crop worship, treated as your girlfriend, and I insulted your parents. No, I couldn't have planned this. Mmm, mmm." -- Lois to Clark, 'Green, Green Glow of Home'